Novel insights on causes of disproportionate trends between particulate NO3− and NOx emissions in Canadian urban atmospheres

Fan, Qinchu; Yao, Xiaohong; Zhang, Leiming

doi:10.5194/acp-26-4917-2026

Articles | Volume 26, issue 7

https://doi.org/10.5194/acp-26-4917-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-26-4917-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 26, issue 7

Research article

|

14 Apr 2026

Research article |

| 14 Apr 2026

Novel insights on causes of disproportionate trends between particulate NO₃⁻ and NO_x emissions in Canadian urban atmospheres

Qinchu Fan, Xiaohong Yao, and Leiming Zhang

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Views and downloads (calculated since 15 Dec 2025)

Month	HTML	PDF	XML	Total
Dec 2025	160	82	20	262
Jan 2026	226	76	32	334
Feb 2026	106	34	16	156
Mar 2026	156	34	24	214
Apr 2026	344	84	18	446
May 2026	186	71	10	267
Jun 2026	20	19	3	42
Jul 2026	61	45	15	121
Aug 2026	44	49	7	100
Sep 2026	149	155	119	423
Oct 2026	146	120	89	355
Nov 2026	38	19	13	70

Cumulative views and downloads (calculated since 15 Dec 2025)

Month	HTML	PDF	XML	Total
Dec 2025	160	82	20	262
Jan 2026	226	76	32	334
Feb 2026	106	34	16	156
Mar 2026	156	34	24	214
Apr 2026	344	84	18	446
May 2026	186	71	10	267
Jun 2026	20	19	3	42
Jul 2026	61	45	15	121
Aug 2026	44	49	7	100
Sep 2026	149	155	119	423
Oct 2026	146	120	89	355
Nov 2026	38	19	13	70

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Total article views: 2,790 (including HTML, PDF, and XML) Thereof 2,698 with geography defined and 92 with unknown origin.

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Short summary

This study finds that the disproportionate multi-decadal trends between particulate nitrate and NO_x emissions in Canadian urban atmospheres are driven by reductions in primary fine-fraction nitrate emissions, localized dispersion processes, and wind anomalies modulated by the Arctic Oscillation. These results help explain the weak or absent response of fine-fraction nitrate to NO_x emission reductions observed globally, particularly in cold-climate regions.